Toshiba Carrier RAV-SP180AT2-UL Service Manual page 69

CODE Outdoor
No. LED display
[P19] <Display 1> <Display 2>
Check and troubleshooting
(Item without special mention Indicates part of outdoor unit.)
[4-way valve inverse error]
Is operation of
4-way valve normal?
(Check pipe temp., etc. in
cooling/heating operation.)
NO
Is the coil
resistance value of 4-way valve
between 1.3 and 1.6kΩ?
YES
Check operation of
outdoor P.C. board.
(See below.)
OK
Check 4-way valve.
Defect → Replace
Check method of outdoor P.C. board operation (Self-hold valve type)
1) Set SW804 of Dip switch as the following figure and then push SW801 for
approx. 1 second to check exchange operation to cooling cycle/heating cycle.
• Power is turned on for approx. 10 seconds.
• When checking again, check operation 1 minute or more after the first check
because exothermic of part (Coil, resistance R700) is large.
(There is no problem when coil is not connected.)
2) After check, turn off all the Dip switch SW804.
Exchange to cooling cycle
SW804 SW801 CN701
1
Push
4
DC200V or more
Note) Check by tester
Analog tester : Good if over DC200V
Digital tester : Good if Max. value is over DC200V though the varied
value may be displayed.
– 69 –
Temperature sensor check
TE sensor CN601
YES
TS sensor CN600
Indoor TC sensor
Defect → Correct and repair
NO
Replace coil of 4-way valve.
Error
Check outdoor P.C. board.
Defect → replace
Exchange to heating cycle
SW804 SW801 CN701
1
Push
4
DC200V or more